Black-legged (Deer) Tick

Borrelia miyamotoi disease


Borrelia miyamotoi disease is caused by is a bacterium called Borrelia miyamotoi that is spread to people through the bite of an infected Black-legged (“deer”) tick (Ixodes scapularis). This is an emerging infection in the United States and in Connecticut. B. miyamotoi was first identified in ticks from Japan in 1995, and since then it has been identified in the Black-legged "deer" tick (Ixodes scapularis) in Connecticut. Treatment is available and is similar to that for Lyme disease. The best way to prevent illness from Borrelia miyamotoi is to prevent tick bites.


About Borrelia miyamotoi Disease


Information for Clinicians


Clinical Guidance (CDC)


Connecticut Provider Reporting Information

Reportable Disease Confidential Case Report, PD-23

Connecticut Laboratory Reporting Information

Reportable Laboratory Findings form, OL-15C


Directory of Clinical Testing Services provided by the State Public Health Laboratory

State Public Health Laboratory Contacts – for additional information


Tick-borne Diseases of the United States – a Reference Manual for Healthcare Providers


Connecticut Borrelia miyamotoi Surveillance

The Connecticut Department of Public Health (DPH) added Borrelia miyamotoi disease to the list of state-wide reportable diseases in 2019. State surveillance will help characterize the epidemiology, clinical spectrum, and incidence of B. miyamotoi disease in Connecticut as well as assist with the national description of disease.

Cases of Borrelia miyamotoi reported to the DPH from January 1 – December 31, 2019.



Connecticut Annual Infectious Disease Statistics 




This page last updated 1/14/2020.